Fred Hutchinson Cancer Research Center - Vaccine and Infectious Disease Division, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Washington, affiliation not provided to SSRN, University of Washington, affiliation not provided to SSRN, University of Washington, University of Washington, affiliation not provided to SSRN, University of Washington - Department of Laboratory Medicine and Microbiology and University of Washington